Shield is a fusion of Albers conic and Bonne projections at the equator, with another standard parallel able to be designated.

Classifications

Pseudoconic
Equal-area

Graticule

Meridians: Partly straight, partly complex curves
Parallels: Circule arcs
Poles: When “Standard parallel” is positive, the north pole is a circular arc and the south pole is a point. When “Standard parallel” is negative, the south pole is a complex curve and the
Symmetry: Symmetric east-west.